Yr.10 Unit 2. Electonics

Ohms Law is the mathematical relationship between.....

• Voltage, Current, Resistance

• Voltage, Current, Hertz

• EMF, Induction, Flux

• Area, Density, Field Strength

Resistance is measured in....

• Current

• Voltage

• Ohms

• Amps

A system is made up of 3 parts, the Input, Process & Output. Which of the following components is an Input within the night light circuit

• Light Dependent Resistor

• Transistor

• LED

• Bulb

A system is made up of 3 parts, the Input, Process & Output. Which of the following components is an Process within the night light circuit

• Battery

• Transistor

• LED

• Bulb

A system is made up of 3 parts, the Input, Process & Output. Which of the following components is an Output within the night light circuit

• Battery

• Transistor

• LED

• Bulb

Answer explanation

The LED will light up when the a signal voltage is detected at the Base leg of the Transistor, allowing a large current to flow from the collector to the Emitter, & lighting up the LED

What happens this component when a light source is removed

• an LED is switched on

• the resistance of the component increases

• the resistance of the component decreases

• the current multipied by 5

What component does this symbol represent

• Light Dependent resistor

• NPN Transistor

• Thyristor

• Thermistor

What are the three legs called on this component

• inout, process, output

• Base, Collector, Emitter

• Anode, Cathode, Gate

• Base, Gate, Emitter

What is the function of this component

• when the temperature increases the resistance on the current base leg will increase, the component will switch on and allow a larger current flow from the Collector to the Emitter

• when a large signal current arrives at the base leg, the component will switch on and allow a Smaller current flow from the Collector to the Emitter

• when a small signal current is sent to the base leg, the component will switch on and allow a larger current to flow from the Collector to the Emitter

• When the light decreases the reistance increases, forcing the current to travel along a different path.

If you were given the following equations. What two values would you already know and what value would you want to find

I=V/R

• Know: Amps & Ohms

  Finding: Voltage

• Know: Voltage & Resistance

  Finding: Current

• Know: Current & Resistance

  Finding: Amplitude

• Know: Electro-magnetic force & Flux densisty

  Finding: Inductance